Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$86.9M |
| 2 |
Walt Disney
DIS
|
+$25.5M |
| 3 |
Baidu
BIDU
|
+$12.3M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$12.3M |
| 5 |
RHT
Red Hat Inc
RHT
|
+$11.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$60.3M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$33.9M |
| 4 |
Apple
AAPL
|
+$21.1M |
| 5 |
State Street Financial Select Sector SPDR ETF
XLF
|
+$18.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.58% |
| 2 | Technology | 0.42% |
| 3 | Healthcare | 0.34% |
| 4 | Consumer Discretionary | 0.29% |
| 5 | Industrials | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
CTRA
2801
CALL
DELISTED
Coterra Energy
CTRA
| $433K | ﹤0.01% |
166
-1,559
| -90% | -$39.1K |
|
|
ZEUS
2802
PUT
DELISTED
Olympic Steel
ZEUS
| $433K | ﹤0.01% |
273
+219
| +406% | +$3.94K |
|
2803
CALL
Atmos Energy
ATO
$29.9B
| $432K | ﹤0.01% |
42
+39
| +1,300% | +$3.8K |
|
|
AZUL
2804
CALL
DELISTED
Azul
AZUL
| $432K | ﹤0.01% |
148
+117
| +377% | +$3.5K |
|
|
BLUE
2805
DELISTED
bluebird bio
BLUE
| $432K | ﹤0.01% |
212
-469
| -69% | -$826K |
|
|
DQ
2806
PUT
Daqo New Energy
DQ
$790M
| $432K | ﹤0.01% |
655
-1,490
| -69% | -$9.7K |
|
|
TWOU
2807
CALL
DELISTED
2U Inc
TWOU
| $432K | ﹤0.01% |
2
+1
| +100% | +$1.89K |
|
|
FRC
2808
DELISTED
First Republic Bank
FRC
| $432K | ﹤0.01% |
+4,302
| New | +$424K |
|
|
NBL
2809
PUT
DELISTED
Noble Energy, Inc.
NBL
| $432K | ﹤0.01% |
175
-148
| -46% | -$3.35K |
|
2810
ProShares UltraShort MSCI Brazil Capped
BZQ
$2.46M
| $430K | ﹤0.01% |
+931
| New | +$409K |
|
2811
CALL
Clean Harbors
CLH
$16.1B
| $429K | ﹤0.01% |
60
+18
| +43% | +$1.11K |
|
|
TUP
2812
PUT
DELISTED
Tupperware Brands Corporation
TUP
| $429K | ﹤0.01% |
168
+39
| +30% | +$1.19K |
|
|
KSU
2813
PUT
DELISTED
Kansas City Southern
KSU
| $429K | ﹤0.01% |
37
-358
| -91% | -$38.7K |
|
|
GG
2814
DELISTED
Goldcorp Inc
GG
| $429K | ﹤0.01% |
37,535
-35,691
| -49% | -$383K |
|
2815
CALL
ProPetro Holding
PUMP
$1.45B
| $428K | ﹤0.01% |
190
+188
| +9,400% | +$3.36K |
|
2816
CALL
Tenable Holdings
TENB
$3.56B
| $427K | ﹤0.01% |
135
+121
| +864% | +$3.43K |
|
|
REV
2817
DELISTED
Revlon, Inc.
REV
| $427K | ﹤0.01% |
22,047
+19,589
| +797% | +$474K |
|
2818
PUT
Compugen
CGEN
$216M
| $426K | ﹤0.01% |
+1,029
| New | +$3.53K |
|
2819
CALL
Loews
L
$24.3B
| $426K | ﹤0.01% |
89
+20
| +29% | +$944 |
|
2820
PUT
Matsons
MATX
$6.37B
| $425K | ﹤0.01% |
118
+112
| +1,867% | +$3.87K |
|
2821
CALL
Radian Group
RDN
$5.14B
| $425K | ﹤0.01% |
205
+199
| +3,317% | +$3.86K |
|
2822
PUT
Vipshop
VIPS
$6.84B
| $425K | ﹤0.01% |
530
-2,411
| -82% | -$17.1K |
|
|
AIMC
2823
CALL
DELISTED
Altra Industrial Motion Corp
AIMC
| $425K | ﹤0.01% |
+137
| New | +$4.15K |
|
|
NPTN
2824
DELISTED
NEOPHOTONICS CORP
NPTN
| $425K | ﹤0.01% |
67,626
+19,251
| +40% | +$135K |
|
|
WMGI
2825
DELISTED
Wright Medical Group Inc
WMGI
| $425K | ﹤0.01% |
13,530
+6,152
| +83% | +$187K |
|
Similar funds
Simplex Trading's Q1 2019 Portfolio in Review
As of Q1 2019, Simplex Trading held 8,479 positions worth $36B, up 5.5% from $34.1B the previous quarter. Its ten largest holdings account for 35% of the portfolio.
Simplex Trading's Q1 2019 filing shows 1,472 new, 3,049 increased, 2,419 reduced and 1,324 closed positions. Its largest new stake was Walt Disney: 228,471 shares worth $25.4M. The largest sale was Amazon, an estimated $66M.
By sector, the portfolio is most concentrated in Communication Services at 0.58% of assets, up from 0.49% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q1 2019 buy was Walt Disney: 228,471 shares worth $25.4M.
- Simplex Trading added most to Invesco QQQ Trust in Q1 2019, an estimated $86.9M increase.
- Simplex Trading's biggest Q1 2019 reduction was iShares Russell 2000 ETF, cutting an estimated $60.3M.
- Simplex Trading fully exited Amazon in Q1 2019, selling an estimated $66M.
- Simplex Trading's ten largest holdings make up 35% of its $36B portfolio in Q1 2019.
- Simplex Trading opened 1,472 new positions and closed 1,324 in Q1 2019.
- Simplex Trading's portfolio value rose 5.5% quarter-over-quarter to $36B.
Based on Simplex Trading's 13F filing for Q1 2019, filed 18 Apr 2019.